#include<stdio.h>
int main(int argc, char *argv[])
{
	//定义
	int a, b;

	//赋值
	a = 2;
	b = 9;

	//交换
	a = a^b;
	b = a^b;
	a = a^b;

	printf("a=%d, b=%d\n", a, b);

	return 0;
}
